header{
    width: 100%;
    padding: 100px 0;
    background: #dddddd;
}


.header-desc{
    width: 100%;
    color: #555;
}
.header-desc h1{
    font-size: 3.4rem;
    font-weight: 200;
}


.pic-list{
    margin-left: 43px;
    height: 100%;
    overflow: hidden;
}
#vertical-line{
    position: absolute;
    margin-left: 160px;
    width: 3px;
    background: #dddddd;
    height: 75%;
}
.am-gallery{
    margin-left: 100px;
    overflow: hidden;
}
.list-time-box{
    position: absolute;
    margin-top: 20px;
}
.list-time{
    display: inline-block;
    width: 85px;
    float: left;
    color: #66ccff;
    margin-top: 45px;
}
.list-dot{
    position: absolute;
    margin-left: 31px;
    margin-top: 55px;
    display: inline-block;
    width: 5px;
    height: 5px;
    background: #ffffff;
    border: 3px #66ccff solid;
    border-radius: 50%;
}
.am-gallery li{
    display: inline-block;
    float: left;
    background: #eeeeee;
    border-radius: 5px;
    padding: 20px 20px 20px 20px;
    margin-top: 0;
    margin-bottom: 50px;
    margin-left: 100px;
    color: deepskyblue;
    width: 300px;
}
.am-gallery li::before{
    content: "";
    display: inline-block;
    position: absolute;
    border-top: 14px solid transparent;
    border-bottom: 14px solid transparent;
    border-right: 20px solid #eeeeee;
    margin-left: -40px;
    margin-top: 20px;
    font-size: 0;
    line-height: 0;
}

@media only screen and (max-width: 450px) {
    .pic-list{
        margin-left: 0;
    }
    .am-gallery{
        margin-left: 0;
    }
    .list-time-box{
        width: 20%;
        position: relative;
    }
    .list-time{
        display: block;
        font-size: 1.4rem;
    }
    .list-dot{
        display: none;
    }
    #vertical-line{
        display: none;
    }
    .am-gallery li{
        display: inline-block;
        float: left;
        background: #eeeeee;
        border-radius: 5px;
        padding: 1rem;
        margin-top: 0;
        margin-bottom: 50px;
        margin-left: 0;
        color: deepskyblue;
        width: 90%;
    }
    .am-gallery li::before{
        content: "";
        display: inline-block;
        position: absolute;
        border-top: 14px solid transparent;
        border-bottom: 14px solid transparent;
        border-right: 20px solid #eeeeee;
        margin-left: -2.6rem;
        margin-top: 2rem;
        font-size: 0;
        line-height: 0;
    }
}

footer{
    background: #dddddd;
    padding: 10px 0;
    text-align: center;
}
